Seems to be a great way to get rid of carbon deposits, especially from the nooks and crannies where it's hard to reach with a patch. Yesterday I cleaned the chamber lug area of the new AR-15 this way - just sprayed down with Hoppe's Elite foaming cleaner, scrubbed with an old toothbrush, and then hosed it out with the Gun Scrubber. What I was a little concerned about was the anodized aluminum finish of the upper. But it didn't seem to affect it. I looked up the MSDS, and it's composed of about 70% isopropyl alcohol and 30% hexane, which Wiki states is a "relatively safe, largely nonreactive solvent": https://www.birchwoodcasey.com/getattach...l-2010.pdf.aspx https://en.wikipedia.org/wiki/Hexane I also used the same method on the Dan Wesson Heritage 1911 - soaked inside of slide and frame with the Hoppe's Elite foaming cleaner, toothbrush to knock all the carbon loose, then hosed out with the Gun Scrubber. Again, I was a little concerned that it might discolor the matte stainless finish of the frame, but it didn't. I did remove the G10 grips first. I sprayed into the extractor (it's never been apart) and quite a bit of crud came out. Anything wrong with doing that? Another thing - I have read in a few places on here where people said that non-chlorinated brake cleaner "is the same thing as Gun Scrubber". Well, I looked up the MSDS for a popular aerosol brake cleaner - CRC Brakleen, and it is definitely NOT the same thing as Gun Scrubber. While Gun Scrubber is mostly isopropyl alcohol (very mild solvent) with some hexane (mild petroleum distillate solvent), CRC Brakleen contains quite a few other ingredients, the most troubling of which are toluene (10-20%) and acetone (5-15%), which I know to be strong solvents. Brakleen's main constituent is methyl alcohol, which is definitely stronger and more harsh than isopropyl alcohol. CRC Brakleen MSDS: http://docs.crcindustries.com/msds/5088.pdf So, any gun finishes the BC Gun Scrubber spray wouldn't be safe for? What about, for example, the high-polish blueing on my Browning Hi Power?